Pig: New lightweight object for string consumption

- Like Nibbler, but without the string copy, and allowing multiple pigs to
  eat the string at the same time.

    Pig: A tool for cleaning out pipes
    Pig: A greedy person
    Pig: To eat quickly

src/CMakeLists.txt

@@ -7,6 +7,7 @@ include_directories (${CMAKE_SOURCE_DIR}
 set (timew_SRCS Grammar.cpp     Grammar.h
                 Lexer.cpp       Lexer.h
                 LR0.cpp         LR0.h
+                Pig.cpp         Pig.h
                 Rules.cpp       Rules.h)
 
 add_library (timew STATIC ${timew_SRCS})

src/Pig.cpp

@@ -0,0 +1,55 @@
+////////////////////////////////////////////////////////////////////////////////
+//
+// Copyright 2015, Paul Beckingham, Federico Hernandez.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+//
+// http://www.opensource.org/licenses/mit-license.php
+//
+////////////////////////////////////////////////////////////////////////////////
+
+#include <cmake.h>
+#include <Pig.h>
+#include <utf8.h>
+#include <sstream>
+
+////////////////////////////////////////////////////////////////////////////////
+Pig::Pig (const std::string& text)
+: _text (text)
+, _mark (std::string::npos)
+, _cursor (0)
+, _debug (false)
+{
+}
+
+////////////////////////////////////////////////////////////////////////////////
+void Pig::debug (bool value)
+{
+  _debug = value;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+std::string Pig::dump () const
+{
+  std::stringstream out;
+
+  return out.str ();
+}
+
+////////////////////////////////////////////////////////////////////////////////

src/Pig.h

@@ -0,0 +1,49 @@
+////////////////////////////////////////////////////////////////////////////////
+//
+// Copyright 2015, Paul Beckingham, Federico Hernandez.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+//
+// http://www.opensource.org/licenses/mit-license.php
+//
+////////////////////////////////////////////////////////////////////////////////
+
+#ifndef INCLUDED_PIG
+#define INCLUDED_PIG
+
+#include <string>
+
+class Pig
+{
+public:
+  Pig (const std::string&);
+
+  void debug (bool);
+  std::string dump () const;
+
+private:
+  const std::string&     _text;
+  std::string::size_type _mark;
+  std::string::size_type _cursor;
+  bool                   _debug;
+};
+
+#endif
+
+////////////////////////////////////////////////////////////////////////////////